The text of today is continuation of the earlier text (12, 25-37) in which Jesus makes a series of pronouncements regarding the coming judgement. The Pharisees respond to these statements of Jesus by demanding a sign. In Matthew only disciples address Jesus as Lord, and the address “Teacher” here by the Pharisees indicates that they are not disciples. The sign they demand is a proof of Jesus’ identity. Jesus’ response to the Pharisees’ demand is to make another pronouncement. In this pronouncement he regards them as an “evil and adulterous generation” which means a people who have closed their hearts to the revelation that God is constantly making. The sign of Jonah here refers clearly to the resurrection of Jesus. Further, it is the Gentiles (people of Nineveh) who will rise up and condemn the Jews. It is a clear reversal of roles. Jesus is greater than both Jonah and Solomon.
The manner in which some of us mourn and weep at the death of a loved one seems to indicate that we do not believe in the resurrection. This is the only sign that Jesus continues to give. If we keep looking for other signs of his presence we might find ourselves in the same position as the Pharisees of his time and miss him who makes himself available and visible at every moment of our lives.